# Casimir I of Opole

> Duke of Opole-Racibórz

**Wikidata**: [Q667930](https://www.wikidata.org/wiki/Q667930)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Casimir_I_of_Opole)  
**Source**: https://4ort.xyz/entity/casimir-i-of-opole


## References

1. Freebase Data Dumps. 2013
2. CERL Thesaurus
3. Sejm-Wielki.pl
4. [Bibliography of the History of the Czech Lands](https://biblio.hiu.cas.cz/records/95421314-1f89-4708-88a6-f3531278681c)